Christina often performs John Lennon and Yoko Ono’s classic “Happy Xmas (War is Over)” on tour with her band so she wasn’t too nervous about putting that on her album, but she was concerned that she wouldn’t impress Lennon’s better half.

“I was just more nervous to get it approved by Yoko Ono,” she said. “Knowing whether or not she approved it, that was a little nerve wracking.”

Fortunately, Christmas came early for Christina and Yoko said yes to her version. Unfortunately though, the “A Thousand Years” singer didn’t get a chance to talk to her herself.

“I didn’t have to call and say ‘pretty please’ or sing for her,” she explained. “But I would have!”